Non-authenticated requests return 401 but still logs

I setup HTTP GELF Input with Authentication set. It allows me to log and returns 200 when I include the token, but without it it is expectidly returning 401, however the log is still being logged and sent to the stream in graylog.

## Expected Behavior
Without a token it should return 401 and should not log.

## Current Behavior
Without token it is returning 401, but still logging.

## Steps to Reproduce (for bugs)

1. Create HTTP GELF input, with auth and token set
2. Send valid log without auth token

## Context
* I am sending logs from lambda to graylog via GLEF http, and I am hosting graylog on a local server, so I want to use auth for the http endpoint rather than it being open.

## Your Environment
* Graylog Version: 6.1.4